EN
For every finite Abelian group Γ and for all $g,a₁,..., a_{k} ∈ Γ$, if there exists a solution of the equation $∑_{i=1}^{k} a_{i}x_{i} = g$ in non-negative integers $x_{i} ≤ b_{i}$, where $b_{i}$ are positive integers, then the number of such solutions is estimated from below in the best possible way.